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Last name Clemen (Clemen , Клемен ) , in all the world, is quite a rare cognomen. The cognomen Clemen is habitual in Luxembourg, where it is quite a rare surname, Philippines, and Nicaragua, where it is a rare surname. Not in comparison with a country's population, it is commonest in Philippines, the United States, and Germany. Also, Clemen is the forename as well as the last name.